CN113855820A - Optical device for nursing and disinfection - Google Patents

Optical device for nursing and disinfection Download PDF

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Publication number
CN113855820A
CN113855820A CN202110958373.XA CN202110958373A CN113855820A CN 113855820 A CN113855820 A CN 113855820A CN 202110958373 A CN202110958373 A CN 202110958373A CN 113855820 A CN113855820 A CN 113855820A
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light source
voltage
adaptive
current
adaptive light
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CN113855820B (en
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陈婷
刘江兰
付波
何建刚
刘猛
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Southern Hospital Southern Medical University
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Southern Hospital Southern Medical University
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/08—Radiation
    • A61L2/084—Visible light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/24—Apparatus using programmed or automatic operation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/26—Accessories or devices or components used for biocidal treatment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
    • A61L2202/10—Apparatus features
    • A61L2202/14—Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
    • A61L2202/20—Targets to be treated
    • A61L2202/25—Rooms in buildings, passenger compartments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • A61L2209/11—Apparatus for controlling air treatment
    • A61L2209/111—Sensor means, e.g. motion, brightness, scent, contaminant sensors

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

The invention provides an optical device for nursing and disinfection, which comprises: the device comprises an adaptive light source component, a bracket, a filter component, a heat dissipation device, an ultrasonic distance sensor, a power supply with variable current control and a microcontroller, wherein the microcontroller directly adjusts the brightness of the adaptive light source component by pulse width modulation and generates antibacterial light for automatic calibration by matching with an optical filter; an adaptive light source assembly mounted on the adjustable support allowing the distance of the adaptive light source assembly from the target surface for optical disinfection to be variable; the ultrasonic distance sensor which is positioned in the same direction as the adaptive light source component is fixed to the adjustable bracket; cooling water is circulated from the reservoir into a heat sink mounted to the back of the adaptive light source assembly to prevent overheating of the adaptive light source assembly. The device avoids unnecessary waste of energy and a reduction in the lifetime of the adaptive light assembly resulting from keeping the light intensity at a maximum level.

Description

Optical device for nursing and disinfection
Technical Field
The invention relates to the field of nursing, in particular to an optical device for nursing and disinfection.
Background
Healthcare-related infections are one of the major challenges facing hospitals for patients entering the institution and in the operating rooms of the hospital. Pathogens in these areas are easily transmitted from one person to another. Since the human immune system is weak during the treatment phase, this makes it easy for bacteria to attack the body and spread rapidly in this area. One of the traditional and most common methods of antimicrobial technology involves the use of optical systems in the wavelength range 240-260nm, which belongs to the ultraviolet and short-wave ultraviolet radiation categories, but which cannot be used in the presence of indoor personnel, which is a major drawback of this technology. Others, such as coating surfaces with heavy metals such as silver or copper, need to disinfect, which exhibits antimicrobial properties and thus prevents the growth of bacterial pathogens on the surface, but which may last only weeks, and are very inefficient and not very cost effective to use. Therefore, there is a need for a safer technique that can be used in the presence of a person and that keeps the disinfection system essentially continuous.
Disclosure of Invention
In order to solve the technical problems, the invention provides an optical device for nursing and disinfection, which avoids unnecessary energy waste caused by keeping the light intensity at the maximum level and the reduction of the service life of an adaptive light assembly.
The invention provides an optical device for nursing and disinfection, which comprises:
an adaptive light source component, a bracket, a filter component, a heat sink, an ultrasonic distance sensor, a power supply with variable current control, a microcontroller,
the microcontroller directly adjusts the brightness of the self-adaptive light source component by pulse width modulation and generates automatically calibrated antibacterial light by matching with the optical filter;
an adaptive light source assembly mounted on the adjustable support allowing the distance of the adaptive light source assembly from the target surface for optical disinfection to be variable;
the ultrasonic distance sensor which is positioned in the same direction as the adaptive light source component is fixed to the adjustable bracket;
cooling water is circulated from the reservoir into a heat sink mounted to the back of the adaptive light source assembly to prevent overheating of the adaptive light source assembly.
The device has a filter assembly to provide the visible wavelength range required for sterilization. The rate of sterilization is controlled by the size of the filter assembly used, the distance of the sterilization process, and the assembly of the power source used. The intensity value of the adaptive light source assembly changes with the distance of the disinfection process and with the power of the power source used.
Wherein the final strength of the falling on the sterilized surface is I2With varying initial light source intensity I1The relationship between the effects of (a) is shown in formula (1):
I2＝K×I1 (1)
Figure BDA0003221211500000021
where K is a multiplication factor depending on the diameter of the filter used, and K is 4.196 × 10-6，P1Is a main power supply; i is1Is the intensity of the initial light source; d is the distance of the sterilized surface from the light source whose intensity is to be measured; i is the final intensity falling on the surface of the sterilization light.
The invention provides a schematic diagram of an optical device for nursing and disinfection. The adaptive light source assembly is the primary power source that emits light at different wavelengths, followed by an optical filter assembly that acts as a high intensity narrow bandpass filter, providing an output wavelength of 405nm, which is then incident into the operating room and surgical tray environment for sterilizing the patient with bacteria. A plurality of sensors placed in the operating room for detecting the intensity level, the plurality of sensors detecting the intensity of the illumination, and if sufficient to kill bacteria, taking no action, otherwise sending a signal to the processor. Then, correspondingly, the signal is sent to a processing unit which increases or decreases the intensity level by sending a command signal to the adaptive light assembly.
The device also has a mobile platform with sensors that sense and detect fluorescence of biological contaminants illuminated with visible light to locate the contaminated area, making the device a mobile, continuous platform that increases the extent and selectivity of the area while eliminating hospital field bacteria.
The apparatus also has a ballast comprising: the intelligent controller samples the feedback light intensity signal to obtain the gating signals of the power factor correction stage and the power stage.
Fluorescent lamps having adaptive light source assemblies operating at high frequencies exhibit negative delta resistance, where V100，I100Rated voltage and current, V20，I20Is a voltage and current at 20%, RsIs the slope of the linearization region, VHIs a shaft VoThe upper line pushes out the voltage. Can be calculated by equation (3):
Figure BDA0003221211500000031
let Vo, Io be any point on this line, then:
Figure BDA0003221211500000032
then, the resistance of the adaptive optical component is calculated by equation (5)
Figure BDA0003221211500000033
Wherein the extrapolated voltage is obtained by equation (6):
VH＝V20-I20·Rs＝V100-I100·Rs (6)
from the preceding formula, can be selected from V100，I100 and V20，I20Two constant parameters R are obtaineds，VHAnd calculating the self-adaptive optical component resistance of different working points according to the self-adaptive optical component resistance.
In order to solve the problems of harmonic current distortion and electromagnetic interference caused by the ballast driven by the rectified voltage source, a power factor correction stage is added in front of the high-frequency ballast inverter. The power factor correction stage adopts boost type to correct power factor of AC line current distortion caused by full-bridge rectification, and utilizes critical conduction mode to control sampled voltage VDCAnd voltage command VCMDIs fed into a digital PI controller to generate an error signal VERRTo the multiplier. The other input of the multiplier is the input rectified AC line voltage VRECTScaling of the multiplier output VREFWith sampled switching current ISWA comparison is made. I isSWBelow VREFThe power switch is turned on and vice versa. The zero current detection circuit measures the voltage across the inductor, which will drop to zero when the current reaches zero. At this point, the switch is opened again.
Switching time TON and TOFFExpressed as follows:
Figure BDA0003221211500000034
Figure BDA0003221211500000035
wherein LpIs a boost inductor, ILP_pkIs the peak inductor current, Vi(rms)Is the root mean square value of the input voltage, VDCIs the boosted output voltage. The waveform of the charging current of the inductor is triangular; the peak inductor current is expressed as:
Figure BDA0003221211500000041
where Pi is the input power. Since the power factor correction operates in boundary conduction mode, the switching frequency fsCan be expressed as:
Figure BDA0003221211500000042
and (7), (8) and (9) are substituted into (10) to obtain the boost inductor:
Figure BDA0003221211500000043
the power stage is composed of a half-bridge inverter, the working frequency of the inverter is slightly higher than the resonant frequency, so that the resonant circuit has an inductive property, soft switching is realized in the inverter, and switching loss and electromagnetic emission are reduced. The adaptive optical assembly is triggered by a high voltage ac waveform and the half bridge inverter provides a square wave having an amplitude equal to the output voltage of the power factor correction stage. Resonant tank circuits are commonly used to generate high voltage ac waveforms from square waves. The electronic ballast is a series resonance-parallel load, and the input-output voltage transfer function of the electronic ballast is as follows:
Figure BDA0003221211500000044
wherein Vs (j ω) represents a square wave voltage VDCThe fundamental component of (a). Vo (j ω) represents the voltage across the lamp,
Figure BDA0003221211500000045
is a quality factor, RLampIs the lamp resistance, omegasIs the frequency of the switching angle, and,
Figure BDA0003221211500000046
is the natural angular frequency.
In order to intelligently control the adaptive light assembly, the ballast adopts a frequency control method to realize dimming operation. And (5) is substituted into (12) to obtain the voltage gain from input to output:
Figure BDA0003221211500000047
wherein ,
Figure BDA0003221211500000048
is the imaginary part of the resonant equivalent impedance Zo. Let Vbase＝VH；Zbase＝|Rs|；Ibase＝VH/|Rs|；ωbase＝ωo(ii) a Normalizing formula (13) and dividing by the normalized RLamp(n)Normalized output current Io(n)Can be obtained by the formula (14):
Figure BDA0003221211500000051
from equation (14), the desired output current is obtained which is proportional to the light intensity.
The optical device for nursing and disinfection provided by the invention can continuously disinfect indoor air, surfaces and materials according to the visible light spectrum (with the wavelength concentrated at 405nm) of 400-410nm, the visible light has no harm to human beings, but the ability of inactivating bacteria can be realized, the adaptive feedback network can support longer service life and increase the service life of providing 7x24 environment disinfection in facilities, and meanwhile, the brightness of the adaptive light assembly is controlled by the ballast operation condition, so that unnecessary energy waste caused by keeping the light intensity at the maximum level and the reduction of the service life of the adaptive light assembly are avoided, and the optical device has the advantages of low cost, energy conservation and the like.
Drawings
FIG. 1 is a schematic view of an optical device for disinfecting care in accordance with the present invention.
FIG. 2 is a schematic diagram of a ballast for a nursing disinfecting optical device of the present invention.
Fig. 3 is a circuit diagram of a ballast for a nursing light unit according to the present invention.
Wherein, 1-adaptive light source assembly, 2-filter assembly, 3-operating room and tray environment, 4-multiple sensors, 5-processing unit, 6-alternating current, 7, power factor correction stage, 8-output power stage, 9-intelligent controller, 10-electromagnetic filter, 11-rectifier, 12-power factor corrector, 13-inverter, 14-resonant tank circuit, 15-gate driver, 16-differential amplifier, 17-PI controller, 18-half bridge circuit
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides an optical device for nursing and disinfection, which comprises:
an adaptive light source component, a bracket, a filter component, a heat sink, an ultrasonic distance sensor, a power supply with variable current control, a microcontroller,
the microcontroller directly adjusts the brightness of the self-adaptive light source component by pulse width modulation and generates automatically calibrated antibacterial light by matching with the optical filter;
an adaptive light source assembly mounted on the adjustable support allowing the distance of the adaptive light source assembly from the target surface for optical disinfection to be variable;
the ultrasonic distance sensor which is positioned in the same direction as the adaptive light source component is fixed to the adjustable bracket;
cooling water is circulated from the reservoir into a heat sink mounted to the back of the adaptive light source assembly to prevent overheating of the adaptive light source assembly.
The device has a filter assembly to provide the visible wavelength range required for sterilization. The rate of sterilization is controlled by the size of the filter assembly used, the distance of the sterilization process, and the assembly of the power source used. The intensity value of the adaptive light source assembly changes with the distance of the disinfection process and with the power of the power source used.
Wherein the final strength of the falling on the sterilized surface is I2With varying initial light source intensity I1The relationship between the effects of (a) is shown in formula (1):
I2＝K×I1 (1)
Figure BDA0003221211500000061
where K is a multiplication factor depending on the diameter of the filter used, and K is 4.196 × 10-6，P1Is a main power supply; i is1Is the intensity of the initial light source; d is the distance of the sterilized surface from the light source whose intensity is to be measured; i is the final intensity falling on the surface of the sterilization light.
As shown in FIG. 1, the present invention provides a schematic view of an optical device for nursing and disinfection. The adaptive light source assembly is the primary power source that emits light at different wavelengths, followed by an optical filter assembly that acts as a high intensity narrow bandpass filter, providing an output wavelength of 405nm, which is then incident into the operating room and surgical tray environment for sterilizing the patient with bacteria. A plurality of sensors placed in the operating room for detecting the intensity level, the plurality of sensors detecting the intensity of the illumination, and if sufficient to kill bacteria, taking no action, otherwise sending a signal to the processor. Then, correspondingly, the signal is sent to a processing unit which increases or decreases the intensity level by sending a command signal to the adaptive light assembly.
The device also has a mobile platform with sensors that sense and detect fluorescence of biological contaminants illuminated with visible light to locate the contaminated area, making the device a mobile, continuous platform that increases the extent and selectivity of the area while eliminating hospital field bacteria.
The apparatus also has a ballast comprising: the intelligent controller samples the feedback light intensity signal to obtain the gating signals of the power factor correction stage and the power stage.
Fluorescent lamps having adaptive light source assemblies operating at high frequencies exhibit negative delta resistance, where V100，I100Rated voltage and current, V20，I20Is a voltage and current at 20%, RsIs the slope of the linearization region, VHIs a shaft VoThe upper line pushes out the voltage. Can be calculated by equation (3):
Figure BDA0003221211500000071
let Vo, Io be any point on this line, then:
Figure BDA0003221211500000072
then, the resistance of the adaptive optical component is calculated by equation (5)
Figure BDA0003221211500000073
Wherein the extrapolated voltage is obtained by equation (6):
VH＝V20-I20·Rs＝V100-I100·Rs (6)
from V according to the preceding formula100，I100 and V20，I20Two constant parameters R are obtaineds，VHAnd calculating the self-adaptive optical component resistance of different working points according to the self-adaptive optical component resistance.
In order to solve the problems of harmonic current distortion and electromagnetic interference caused by the ballast driven by the rectified voltage source, a power factor correction stage is added in front of the high-frequency ballast inverter. The power factor correction stage adopts a boost typePerforming power factor correction on current distortion of AC line caused by full-bridge rectification, and controlling by critical conduction mode to obtain sampled voltage VDCAnd voltage command VCMDIs fed into a digital PI controller to generate an error signal VERRTo the multiplier. The other input of the multiplier is the input rectified AC line voltage VRECTScaling of the multiplier output VREFWith sampled switching current ISWA comparison is made. I isSWBelow VREFThe power switch is turned on and vice versa. The zero current detection circuit measures the voltage across the inductor, which will drop to zero when the current reaches zero. At this point, the switch is opened again.
Switching time TON and TOFFExpressed as follows:
Figure BDA0003221211500000081
Figure BDA0003221211500000082
wherein LpIs a boost inductor, ILP_pkIs the peak inductor current, Vi(rms)Is the root mean square value of the input voltage, VDCIs the boosted output voltage. The waveform of the charging current of the inductor is triangular; the peak inductor current is expressed as:
Figure BDA0003221211500000083
where Pi is the input power. Since the power factor correction operates in boundary conduction mode, the switching frequency fsExpressed by equation (10):
Figure BDA0003221211500000084
and (7), (8) and (9) are substituted into (10) to obtain the boost inductor:
Figure BDA0003221211500000085
the power stage is composed of a half-bridge inverter, the working frequency of the inverter is slightly higher than the resonant frequency, so that the resonant circuit has an inductive property, soft switching is realized in the inverter, and switching loss and electromagnetic emission are reduced. The adaptive optical assembly is triggered by a high voltage ac waveform and the half bridge inverter provides a square wave having an amplitude equal to the output voltage of the power factor correction stage. Resonant tank circuits are commonly used to generate high voltage ac waveforms from square waves. The electronic ballast is a series resonance-parallel load, and the input-output voltage transfer function of the electronic ballast is as follows:
Figure BDA0003221211500000086
wherein Vs (j ω) represents a square wave voltage VDCThe fundamental component of (a). Vo (j ω) represents the voltage across the lamp,
Figure BDA0003221211500000087
is a quality factor, RLampIs the lamp resistance, omegasIs the frequency of the switching angle, and,
Figure BDA0003221211500000088
is the natural angular frequency.
In order to intelligently control the adaptive light assembly, the ballast adopts a frequency control method to realize dimming operation. And (5) is substituted into (12) to obtain the voltage gain from input to output:
Figure BDA0003221211500000091
wherein ,
Figure BDA0003221211500000092
is the imaginary part of the resonant equivalent impedance Zo. Let Vbase＝VH；Zbase＝|Rs|；Ibase＝VH/|Rs|；ωbase＝ωo(ii) a Normalizing formula (13) and dividing by the normalized RLamp(n)Normalized output current Io(n)Can be obtained by the formula (14):
Figure BDA0003221211500000093
from equation (14), the desired output current is obtained which is proportional to the light intensity.
The optical device for nursing and disinfection provided by the invention can continuously disinfect indoor air, surfaces and materials according to the visible light spectrum (with the wavelength concentrated at 405nm) of 400-410nm, the visible light has no harm to human beings, but the ability of inactivating bacteria can be realized, the adaptive feedback network can support longer service life and increase the service life of providing 7x24 environment disinfection in facilities, and meanwhile, the brightness of the adaptive light assembly is controlled by the ballast operation condition, so that unnecessary energy waste caused by keeping the light intensity at the maximum level and the reduction of the service life of the adaptive light assembly are avoided, and the optical device has the advantages of low cost, energy conservation and the like.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (2)

1. An optical device for nursing and disinfection, comprising:
an adaptive light source component, a bracket, a filter component, a heat sink, an ultrasonic distance sensor, a power supply with variable current control, a microcontroller,
the microcontroller directly adjusts the brightness of the self-adaptive light source component by pulse width modulation and generates automatically calibrated antibacterial light by matching with the optical filter;
an adaptive light source assembly mounted on the adjustable support allowing the distance of the adaptive light source assembly from the target surface for optical disinfection to be variable;
the ultrasonic distance sensor which is positioned in the same direction as the adaptive light source component is fixed to the adjustable bracket;
circulating cooling water from the reservoir into a heat sink mounted to a back side of the adaptive light source assembly to prevent overheating of the adaptive light source assembly;
the device has a filter assembly to provide a visible wavelength range required for sterilization; the rate of sterilization is controlled by the size of the filter assembly used, the distance of the sterilization process, and the assembly of the power source used; the intensity value of the adaptive light source assembly changes with the distance of the disinfection process and with the power of the power source used;
wherein the final strength of the falling on the sterilized surface is I2With varying initial light source intensity I1The relationship between the effects of (a) is shown in formula (1):
I2＝K×I1 (1)
Figure FDA0003221211490000011
where K is a multiplication factor depending on the diameter of the filter used, and K is 4.196 × 10-6，P1Is a main power supply; i is1Is the intensity of the initial light source; d is the distance of the sterilized surface from the light source whose intensity is to be measured; i is the final intensity of the light falling on the surface of the sterilization;
there is also a ballast comprising: the intelligent controller samples the feedback light intensity signal to obtain gating signals of the power factor correction stage and the power stage;
fluorescent lamps having adaptive light source assemblies operating at high frequencies exhibit negative delta resistance, where V100，I100Rated voltage and current, V20，I20Is a voltage and current at 20%, RsIs the slope of the linearization region, VHIs a shaft VoThe line on pushes out the voltage; can be calculated by equation (3):
Figure FDA0003221211490000021
let Vo, Io be any point on this line, then:
Figure FDA0003221211490000022
the resistance of the adaptive optical component is calculated by equation (5)
Figure FDA0003221211490000023
Wherein the extrapolated voltage is obtained by equation (6):
VH＝V20-I20·Rs＝V100-I100·Rs (6)
from V according to the preceding formula100，I100 and V20，I20Two constant parameters R are obtaineds，VHCalculating the self-adaptive optical component resistance of different working points according to the self-adaptive optical component resistance;
in order to solve the problems of harmonic current distortion and electromagnetic interference caused by a ballast driven by a rectification voltage source, a power factor correction stage is added in front of a high-frequency ballast inverter; the power factor correction stage adopts boost type to correct power factor of AC line current distortion caused by full-bridge rectification, and utilizes critical conduction mode to control sampled voltage VDCAnd voltage command VCMDIs fed into a digital PI controller to generate an error signal VERRTo a multiplier; the other input of the multiplier is the input rectified AC line voltage VRECTScaling of the multiplier output VREFWith sampled switching current ISWComparing; i isSWBelow VREFTime power supplyThe switch is open and vice versa; a zero current detection circuit measures the voltage across the inductor, which will drop to zero when the current reaches zero; at this time, the switch is turned on again;
switching time TON and TOFFExpressed as follows:
Figure FDA0003221211490000024
Figure FDA0003221211490000025
wherein LpIs a boost inductor, ILP_pkIs the peak inductor current, Vi(rms)Is the root mean square value of the input voltage, VDCIs the boost output voltage; the waveform of the charging current of the inductor is triangular; the peak inductor current is expressed as:
Figure FDA0003221211490000031
wherein Pi is the input power; since the power factor correction operates in boundary conduction mode, the switching frequency fsExpressed by equation (10):
Figure FDA0003221211490000032
and (7), (8) and (9) are substituted into (10) to obtain the boost inductor:
Figure FDA0003221211490000033
the power stage consists of a half-bridge inverter, the working frequency of the inverter is slightly higher than the resonant frequency, so that the resonant circuit has an inductive property, soft switching is realized in the inverter, and switching loss and electromagnetic emission are reduced; the adaptive optical component is triggered by a high-voltage alternating current waveform, and the amplitude of a square wave provided by the half-bridge inverter is equal to the output voltage of the power factor correction stage; the resonance tank circuit is used for generating a high-voltage alternating-current waveform from the square wave; the electronic ballast is a series resonance-parallel load, and the input-output voltage transfer function of the electronic ballast is as follows:
Figure FDA0003221211490000034
wherein Vs (j ω) represents a square wave voltage VDCA base component of (a); vo (j ω) represents the voltage across the lamp,
Figure FDA0003221211490000035
is a quality factor, RLampIs the lamp resistance, omegasIs the frequency of the switching angle, and,
Figure FDA0003221211490000036
is the natural angular frequency;
in order to intelligently control the self-adaptive light assembly, the ballast adopts a frequency control method to realize dimming operation;
and (5) is substituted into (12) to obtain the voltage gain from input to output:
Figure FDA0003221211490000037
wherein ,
Figure FDA0003221211490000038
is the imaginary part of the resonant equivalent impedance Zo; let Vbase＝VH；Zbase＝|Rs|；Ibase＝VH/|Rs|；ωbase＝ωo(ii) a Normalizing formula (13) and dividing by the normalized RLamp(n)Normalized output current Io(n)Can be obtained by the formula (14):
Figure FDA0003221211490000041
from equation (14), the desired output current is obtained which is proportional to the light intensity.
2. An optical device for disinfecting care as claimed in claims 1-2, characterized in that the device also has a moving platform with sensors which sense and detect the fluorescence of biological contaminants illuminated by visible light in order to locate the contaminated area, making the device a moving, continuous platform.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5747942A (en) * 1996-07-10 1998-05-05 Enersol Systems, Inc. Inverter for an electronic ballast having independent start-up and operational output voltages
CN204408727U (en) * 2015-03-20 2015-06-17 重庆大学 A kind of self adaptation gradually lit desk lamp
US20190290794A1 (en) * 2018-03-21 2019-09-26 The Boeing Company Systems and Methods for Powering a Load
CN112312608A (en) * 2020-09-27 2021-02-02 合肥科实电子科技有限公司 Intelligent eye protection desk lamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5747942A (en) * 1996-07-10 1998-05-05 Enersol Systems, Inc. Inverter for an electronic ballast having independent start-up and operational output voltages
CN204408727U (en) * 2015-03-20 2015-06-17 重庆大学 A kind of self adaptation gradually lit desk lamp
US20190290794A1 (en) * 2018-03-21 2019-09-26 The Boeing Company Systems and Methods for Powering a Load
CN112312608A (en) * 2020-09-27 2021-02-02 合肥科实电子科技有限公司 Intelligent eye protection desk lamp

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